Valve apparatus for shuttering removal

ABSTRACT

A valve apparatus for use in the removal of shuttering by means of compressed air or other gas. The apparatus comprises a valve body insertible into an aperture in a shuttering plate and having a flange formed at one end thereof for abutment with the inside surface of the shuttering plate. The valve body has a hollow cylindrical portion which extends from the flange and is externally screw-threaded to engage a nut which can be screwed towards the flange so as to clamp the shuttering plate between the nut and the flange, thereby securing the valve apparatus in position. The cylindrical body portion is also connectible with a pipe for supplying compressed air or other gas and accommodates a valve closure device which normally closes an opening through the flange end of the valve body. The valve closure device preferably has a frusto-conical closure element which seats in said opening, the opening also having a frusto-conical configuration but the angle of taper of the closure element being greater than that of the opening, the maximum diameters of the closure element and opening being substantially equal.

O United States Patent 1151 3,666,229 Carrel-Billiard 1 May 30, 1972 54VALVE APPARATUS FOR SHUTTERING 574,992 1/1897 Held ..137/541 x REMOVALPrimary Examiner-.1. Spencer Overholser [72] Inventor: Pierre A. M.Carrel-Billiard, Sav1gny-Sur- Assistant Tobor France Attorney-Emest A.Greenside [73] Assignee: Materiel Special DEnterprlses, Juvisy-sur-Orge, France [57] ABSTRACT [22] Filed: May 18, 1970 A valve apparatusfor use in the removal of shuttering by means of compressed air or othergas. The apparatus com- [21] App]. No-I 38,216 prises a valve bodyinsertible into an aperture in a shuttering plate and having a flangeformed at one end thereof for abutment with the inside surface of theshuttering plate. The valve (gl ..249/66, 25/12%, y has a hollow cylindric a1 portion which extends from the 58 Field e';;;i; ..249/66, 28,29, 189; 25/120; flange and is externally screwthreaded engage a whichcan be screwed towards the flange so as to clamp the shutter- 137/360,541

mg plate between the nut and the flange, thereby securing the [56]References Cited valve apparatus in position. The cylindrical bodyportion is also connectlble with a pipe for supplymg compressed arr orUNITED STATES PATENTS other gas and accommodates a valve closure devicewhich normally closes an opening through the flange end of the valve1,862,368 6/1932 Cuthbertson 137/541 X 1 body The valve closure devicepreferably has a frusto conical 620,936 3/1899 Kunzer ..137/54 closureelement which seats in said opening, the opening also 2,850,785 9/1958Rush1ng.. 249/66 X having a frusto-conical configuration but the angleof taper of 3,15 1,374 10/ I 964 Kersten.... ..249/66 X the closureelement being greater than that of the opening, the 2,480,477 8/1949Joney ..249/66 X maximum diameters of the closure element and openingbeing 3,316,607 5/1967 Kroll ..249/66 x substantially equal 1,198,2879/1916 Spencer... 137/541 X 1,516,531 1 H1924 Halteman ..137/541 X 6Claims, 1 Drawing Figure This invention is concerned with improvementsin or relating to shuttering removal.

The removal of shuttering by compressed air, and more generally by acompressed gas, is now currently used in the building industry. This ishow, in particular, ribbed ceilings are made with moulding honeycombs.

For this purpose, there has been developed the use of certain valves,which facilitate the removal of shuttering. The most simple constructionof these valves is realized by a widemouthed hole, which emerges nearthe surface of the mould and is provided in the shuttering itself, andby a connection to a pipe supplying gas under pressure.

This method, however, has certain disadvantages. Firstly, as is obvious,if the wide-mouthed hole is provided in the shuttering itself, it is anintegral part of it. When the valve is more elaborate and comprisesspring valves, for example, it is then integral with a single shutteringand cannot be re-used on another shuttering which can be a disadvantage.In addition, this type of valve must be carefully fixed to theshuttering which is not actually possible with shuttering of plasticsmaterial, since fixing is difficult.

In order to remedy these disadvantages, the applicant proposes a newtype of valve, the main advantage of which lies in its ease of removal.

Accordingly, it is an object of the invention to provide a device forremoving shuttering in which the shuttering is removed by a compressedgas and constituted by a shuttering plate of slight thickness in whichthere emerges a widemouthed hole attached by a connection to a pipesupplying the compressed gas.

The wide-mouthed hole is provided in a part, separate from theshuttering plate and constituted by a body provided on its outer sidewith a thread and by a cover, which extends perpendicularly to the axisof the thread, and the face of which, located on the side of the saidthread, is plane.

Since the shuttering plate is provided with an aperture allowing apassage for the body of the part, this latter is supported on the upperside of the plate by its own flat side located on the side of thethread, it is fixed to the plate by means of a nut, which in order to dothis co-operates with the thread. Finally, the connection to thecompressed gas pipe is provided in the body of the part,

The invention will now be described by way of example with reference tothe accompanying drawing, in which the single FIGURE is an axial sectionof one embodiment of a device according to the invention.

Referring to the drawing, a part, separate from a shuttering plate 1, isconnected to this plate 1 and is fixed thereto by means of a nut 2screwed onto a thread 3 provided on the outer side of the body 4 of thepart. When the nut 2 abuts against the inner side 1b of the plate 1, thepart abuts against the upper side 1a of the said plate by means of acover 5, the inner side 50, which is directed towards the thread 3,being in contact with the upper side 1a. At 6 above the upper side lathere is partially shown a slab of cast concrete.

In addition, it will be noted that the plate 1 is provided with anaperture which provides a passage for the body 4 in order that the nut 2urges the cover effectively to the plate 1. A countersunk hole 7 opensonto the upper side 5b of the cover 5 and can advantageously be blockedby the head of a screw 8 which tapers at an angle greater than that ofthe hole 7 in order that the contact between said hole and the screwhead takes place preferably at the level of the upper side 5b of thecover 5. In fact, this screw 8 constitutes a valve for the hole 7,

a spring 9 abutting against the inner side of the cover 5 and against anut 10 provided on the thread of the screw 8.

Finally, it will be noted that, in known manner a compressed air pipe 11 surrounds the screw 8 and is screwed on to a thread 12 of the body 4.

Variations in the above embodiment may be made without diverging fromthe scope of the present invention. It will be understood that the verysimple method of fixing the body 4 on the plate 1 by means of the nut 2facilitates mounting and dismounting of the valve without particulardifficulty and thus allows a very flexible use of this type of valve.

But it will also be noted that in the case of the plate 1 being made ofsheet steel, it is also possible to weld the valve onto this sheet, thispossibility of attachment being excluded if the plate 1 is fabricated inplastics material. In this latter combination, which is desirable incertain cases, as combining the advantages of an easy removal from themould due to the low coefficient of adhesion of the plastic and theeffectiveness of the valve for removing the mould, only the method ofmounting according to the invention is viable. In fact, it is no longerpossible to fix the valve on the plate 1 by welding.

The invention thus obviously makes technical progress, since it leads tothe production of shuttering made from plastics material provided withthe most efficient valves. However, it is understood that it appliesonly preferably, but not exclusively to shuttering made of plasticsmaterial.

What is claimed is:

1. Valve apparatus comprising a shuttering plate formed with a recessedopening, a separate body having an apertured flange portion supported insaid recessed opening with its upper surface substantially co-planarwith the upper surface of the shuttering plate, said body having ahollow cylindrical body portion extending from said flange portion andprojecting through and past said plate opening, with the opening definedby the cylindrical body portion in communication with said aperture insaid flange portion, means for securing said body against movementrelative to the shuttering plate, and a valve device mounted on the bodyand biased to normally close the aperture in the flange portion of thebody.

2. Valve apparatus according to claim 1, wherein the external surface ofthat part of the hollow cylindrical body extending past said recessedopening in said plate is screw-threaded, said securing means comprisinga nut engaging said screwthreaded surface and being movable towards saidflange portion for clamping the shuttering plate between said nut andsaid flange portion.

3. Valve apparatus according to claim 1, wherein the inner surface ofsaid hollow cylindrical body portion is threaded, and conduit meansthreadedly connected at one end of the inner threads of the hollow bodyportion, the opposite end of said conduit means being adapted to beconnected to a source of pressure.

4. Valve apparatus according to claim 3, wherein said valve devicecomprises a screw terminating in a head normally sealingly engaging theaperture in said flange portion of said body, said screw having a shankportion disposed within said conduit means.

5. Valve apparatus according to claim 1, wherein the valve device has afrusto-conical closure element and said aperture in said flange portionprovides a frusto-conical seat for said element.

6. Valve apparatus according to claim 5, wherein the angle of taper ofthe closure element is greater than that of the aperture and the maximumdiameters of the closure element and aperture are substantially equal.

1. Valve apparatus comprising a shuttering plate formed with a recessedopening, a separate body having an apertured flange portion supported insaid recessed opening with its upper surface substantially co-planarwith the upper surface of the shuttering plate, said body having ahollow cylindrical body portion extending from said flange portion andprojecting through and past said plate opening, with the opening definedby the cylindrical body portion in communication with said aperture insaid flange portion, means for securing said body against movementrelative to the shuttering plate, and a valve device mounted on the bodyand biased to normally close the aperture in the flange portion of thebody.
 2. Valve apparatus according to claim 1, wherein the externalsurface of that part of the hollow cylindrical body extending past saidrEcessed opening in said plate is screw-threaded, said securing meanscomprising a nut engaging said screw-threaded surface and being movabletowards said flange portion for clamping the shuttering plate betweensaid nut and said flange portion.
 3. Valve apparatus according to claim1, wherein the inner surface of said hollow cylindrical body portion isthreaded, and conduit means threadedly connected at one end of the innerthreads of the hollow body portion, the opposite end of said conduitmeans being adapted to be connected to a source of pressure.
 4. Valveapparatus according to claim 3, wherein said valve device comprises ascrew terminating in a head normally sealingly engaging the aperture insaid flange portion of said body, said screw having a shank portiondisposed within said conduit means.
 5. Valve apparatus according toclaim 1, wherein the valve device has a frusto-conical closure elementand said aperture in said flange portion provides a frusto-conical seatfor said element.
 6. Valve apparatus according to claim 5, wherein theangle of taper of the closure element is greater than that of theaperture and the maximum diameters of the closure element and apertureare substantially equal.